Subsequent AV updates will complete much faster if you are already up to date

Added a feature to the diagnostic utility to help diagnose high CPU issues

Changes to Advanced Download Protection have been made to improve reliability

The ability to disable Advanced Download Protection from the Browser Security Toolbar has been added

Support for ForceField and FireFox 3.5.5

Various stability and reliability improvements

Known Issue

The second AV scan will take approximately the same amount of time as the first scan if you run in the same scan mode

If you opt out of the security toolbar during installation, the browser security will still have presence in the UI and will be non-functional. The "Run Scanner" button on the browser security toolbar is also not enabled